I know this lyric as 'As I came in by Ythanside'. It was recorded by Patti Reid with The Spread Eagle Band, some time in the '70s I think. So far as I know there's no such place as "Ythanside', but other places with the prefix 'Ythan...' (pron 'Eyethan') e.g Ythanwells, are in Scotland. The tune for Patti's song is, for my money, a much lovelier and much less 'Kenneth McKellar' minor key tune, quite different from this.
Frank Lee